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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671b5f8cbbb140f640f89a162e54324cc47cfcab887d28bdca32a4de1363a660' 
  AND token = 'Zlbg8gZwklaaTM4yCaL0cx4eXHIIXTkTiv+neeH/c/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}